mkv h.265 video forced

[Selur]

only why is my video in mkv set to forced ?

That's simply because, I decided that first video track should always be default and forced.
I don't see any reason not to set that option,... (since Hybrid is mainly aimed for single output video stream content)

and what can i do to change this

atm. nothing aside from explaining to me why this is a bad thing and that why I should spend time changing this behavior.
There is no option in Hybrid to disable this behavior and none is planned atm. .
You could remuxing with mkvtoolnix or editing the flags using mkvpropedit to change this on an existing file.

Cu Selur